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Currently submitted to: JMIR Research Protocols

Date Submitted: Nov 17, 2020
Open Peer Review Period: Nov 16, 2020 - Nov 25, 2020
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An early interactive human coaching via a mobile application to improve quality of life in patients who underwent gastrectomy for gastric cancer: Design and protocol of a randomized controlled trial

  • Hak Jin Kim; 
  • Hong Man Yoon; 
  • Keun Won Ryu; 
  • Young-Woo Kim; 
  • So Young Kim; 
  • Jin Myoung Oh; 
  • Gyung Ah Wie; 
  • Hyunyoung Ko; 
  • Jungeun Lee; 
  • Youngin Kim; 
  • Bang Wool Eom



After gastrectomy, patients may experience the postgastrectomy syndrome and face difficulties adapting to everyday diet. Recently, human health coaching via a mobile application (app) has been used for obese patients or patients with chronic diseases, with significant improvements in clinical outcomes.


The aim of this study is to evaluate and compare the effects of human health coaching via a mobile app and conventional face-to-face counseling in patients who underwent gastrectomy for gastric cancers.


This study is a single-institution, prospective randomized controlled trial comparing the mobile health and face-to-face counselling groups. After randomization, participants assigned to the mobile health coaching group will receive health coaching via a mobile app for 3 months after discharge, and the assigned coaches will provide personalized advice based on the self-recorded health data. Participants in the face-to-face group will have 1- and 3-months postoperative dietary consultations with a clinical dietitian. The primary endpoint is the food restriction score on the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire-STO22, and secondary endpoints included all other quality of life scale scores and nutritional parameters. The calculated sample size is 180, and the outcomes will be measured until 1-year post-surgery.


Recruitment started in May, 2020 and currently 51 patients have enrolled in the study. Anticipated date for the completion of enrolment is December 31, 2021 and entire data collection is expected to be completed by December 2022.


This study will show the efficacy of human health coaching via a mobile app on dietary adaptation in patients who underwent gastrectomy. A relational approach based on personal data and timely intervention using a mobile platform could reduce patients’ trial and error and improve QoL. Clinical Trial:, NCT04394585;


Please cite as:

Kim HJ, Yoon HM, Ryu KW, Kim Y, Kim SY, Oh JM, Wie GA, Ko H, Lee J, Kim Y, Eom BW

An early interactive human coaching via a mobile application to improve quality of life in patients who underwent gastrectomy for gastric cancer: Design and protocol of a randomized controlled trial

JMIR Preprints. 17/11/2020:25813

DOI: 10.2196/preprints.25813


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